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ISOLATION OF PHOSPHOARGININE 361 tained in the crystalline state (needles), but is unstable even in the dry condition; the Na and K salts have been isolated but are extremely hygroscopic and therefore of little value; the Li salt is quite stable, but was difficult to prepare in good yield and could not be crystallized. However, it has been found that the Ba may be removed from BaPA by the addition of Na2SO4 and that after several washings of the BaSO4 a quantitative recovery of the phosphoarginine may be obtained. SUMMARY 1. A method is described for the isolation in good yield (10 g./kg.) of phosphoarginine from the muscle of crayfish. 2. The compound was isolated as a barium salt, free from contaminating material and corresponding to the formula C6H.305N4PBa,H2CO3,H20.

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